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UNITED STATES PATENT OFFICE.

PETER H. BAKER, OF SAN FRANCISCO, CALIFORNIA.

PADLOOK.

SPECIFICATION forming part of Letters Patent No. 240,572, dated April26, 1881.

Application filed July 9,1879.

To all whom it may concern:

Be it known that I, PETER H. BAKER, of San Francisco, in the county ofSan Francisco and State of California, have invented a new and ImprovedPadlock, of which the following is a specification.

The object of my invention is to furnish a padlock of compact andconvenient form having a spring-lock not easily picked, and requirin g akey of special construction to open it.

My padlock consists of two curved or semicircular pieces hinged togetherat one end and fitted at the opposite ends with a tongue andspring-tumbler locking mechanism, whereby the ends are connectedtogether and require the use of akey to separate them. The two sidesform a ring adapted for nse in a manner similar to the hasp of anordinary padlock.

In the accompanying drawings, Figure l is a side view of the padlock ina locked position. Fig. 2 is a sectional side elevation with the partsin an unlocked position. Fig. 3, represents details of the lock. Fig. 4shows the key made use of.

Similar letters of reference indicate corresponding parts.

The padlock consists of the two curved or semicircular pieces a 12,connected together bya hinge-pin, c. The end of the piece ais formedwith an apertured tongue, 01, for entering the slot 6 in the end ofpiece I), and when thus entered projects within a recess or chamber thatis formed in b, and is caught by the hooked lugs of revolving tumblersf, which are contained within the recess. The tumblers fare in the formof circular disks, with an aperture in the edge of each for the tongue11 to enter, and with a hook-shaped lug or projection to catch thetongue. Each tumbler is also formed with a concentric key-slot, '5. Twoor more tumblers may be used, and they fill the space b tween the endsof the circular recess, one of apart by a spring, m, fitted at thejoint, as

shown in Fig. 2. r

The key A (shown in Fig. 4) is formed with a projecting ward, 0, curvedcrosswise to conform to the slots i of the tumblers, and in a circle ofwhich the pin Z is the center.

To unlock the padlock the ward 0 will be inserted in the slot of plateh, and through the slots '5 of the tumblers, and then turned on its pin1, to revolve the tumblers and release tongue 01. The hooked lugs of thetumblers cover the slot 0 normally, and they, as well as tongue d, areinclined, so that by pressure the tumblers will be forced back to lockthe parts without the key.

This padlock is light, convenient for use, and adapted for carrying in apersons pocket. The locking mechanism is simple and secure.

Having thus described my invention, I claim as new and desire to secureby Letters Patent In a padlock, the combination of the semicircularoylinders a I), permanently connected at one point of the circle by thehinge-pin c, the part a being provided at its free end with a perforatedtongue, d, and the part b recessed at its jointed end for the receptionof the spring m, and provided at its other end with a cavity containingthe locking-spring t, and an enlarged circular chamber for the tumblersf,

substantially as specified.

PETER HANSON BAKER.

Witnesses:

T. E. GLAUSSEN, W. KERSTAN.

